Underground Copper Cable Systems
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Questions and Answers

Match the following jointing kits with their corresponding cable types:

TSF-1 = Armoured PIJF cable TSF-2 = Armoured PIJF cable RTSF = Quad cable RTS-1 = Standard copper cable

Match the following components with their required usage:

Screening factor = Earthing at stations Copper cables = Induction safety Location box = Joint housing Jointing kit = Thermo shrinkable technique

Match the following specifications with their details:

RDSO's code = Procedure for jointing Latest RDSO specification = Specifications for jointing kits Black & yellow stripes = Location box identification Thermo shrinkable jointing = Heat application for joint integrity

Match the types of cable jointing materials with their characteristics:

<p>Thermo shrinkable material = Used for armoured PIJF cable Reinforced Thermo Shrink Jelly Filled = Used for quad cable Wires for screen and armour = Essential for screening factor Location box = Used for preventing sharp bends</p> Signup and view all the answers

Match the following practices with their purposes:

<p>Making screen and armour through = Preventing electric shock Joint kept underground = Protection from external factors Joint housed in location box = For accessibility and safety Painting location box = For visibility and safety</p> Signup and view all the answers

Match the following types of underground cables with their descriptions:

<p>Quad Cable = Used for control circuits and block interfaces Multi pair Cable = Suitable for exchange subscriber lines Twisted Pair Switch Board Cable = Used for indoor applications RE Cable = Contains both paper and polythene insulation</p> Signup and view all the answers

Match the following specifications with their related cable types:

<p>IRS:TC 30/05 = Quad Cable IRS:TC 41/97 = Multi pair Cable IRS/TEC = Twisted Pair Switch Board Cable Not specified = RE Cable</p> Signup and view all the answers

Match the following conductor diameters with their corresponding cable types:

<p>0.5 mm = Twisted Pair Switch Board Cable 0.63 mm = Multi pair Cable 0.9 mm = Multi pair Cable 1.4 mm = Quad Cable</p> Signup and view all the answers

Match the usage scenarios with the appropriate cable types:

<p>Control circuits = Quad Cable Branch cables = Multi pair Cable Indoor telephone distribution = Twisted Pair Switch Board Cable Outdoor applications = RE Cable</p> Signup and view all the answers

Match the following scenarios with their recommended cable types:

<p>Block sections longer than 12 kms = 1.4 mm Quad cable Indoor building applications = Twisted Pair Switch Board Cable Exchange subscriber lines = Multi pair Cable Underground laying = Quad Cable</p> Signup and view all the answers

Match the following features with the corresponding cable types:

<p>Jelly filled insulation = Quad Cable Not designed for underground laying = Twisted Pair Switch Board Cable Can range from 10 to 200 pairs = Multi pair Cable Replacement planned = RE Cable</p> Signup and view all the answers

Match the following terms with their definitions:

<p>Spare capacity = Future provisions for extensions Polythene insulation = Type of insulation used in cables Control circuits = Links for operational control Block sections = Specific intervals along the track</p> Signup and view all the answers

Match the following descriptions with the cable characteristic:

<p>Has a larger diameter and is used for longer sections = 1.4 mm Quad cable Usually contains multiple pairs = Multi pair Cable Typically used in MDF to exchange wiring = Twisted Pair Switch Board Cable Planned for replacement due to outdated materials = RE Cable</p> Signup and view all the answers

Match the methods of cable termination with their types:

<p>DP Box = Approved type Direct termination = No specific type mentioned PIJF cable termination = Through DP Box of approved type General termination methods = Cables can be terminated in various ways</p> Signup and view all the answers

Match the cable laying methods with their conditions:

<p>Drum use = Must not be rolled off on the road HDD method = Used for road or rail crossings Presence of inspector = Required during excavation for trenches Jointing supervision = Needs skilled and experienced personnel</p> Signup and view all the answers

Match the solutions to issues in cable installation:

<p>Lead or aluminium sheath = Minimizes electro-static induction Twisted pairs = Minimizes electro-magnetic induction Concrete ducts = Should be used for telecom cables as well Video recording = Ensures quality of jointing and laying</p> Signup and view all the answers

Match the types of cables with their characteristics:

<p>Quad type cables = Conductors diagonally opposite form one circuit Telephone cables = Utilize sheathing for induction minimization Signalling cables = Terminated in concrete ducts if provided Telecom cables = Can use signalling ducts following precautions</p> Signup and view all the answers

Match the actions to their requirements in cable laying:

<p>Jointing = Performed using an RDSO specified kit Cable laying = To be supervised by telecom staff Excavation = Requires the presence of a Permanent Way Inspector Documentation = Quality recorded potentially via DVD</p> Signup and view all the answers

Match the techniques with their proper usage in cable laying:

<p>Excavating earth = Needed for installation of junction boxes Laying cables = Shall not drag on the ground Using labourers = To carry cable when wheels are unavailable Utilizing concrete ducts = For laying signalling and telecom cables</p> Signup and view all the answers

Match the safety precautions with their relevant practices:

<p>Using HDD = In busy areas for crossings Twisted pairs = For minimizing induction issues Supervised jointing = To ensure quality control Avoiding ground dragging = For safe cable laying</p> Signup and view all the answers

Match the responsibilities with their designated roles:

<p>Permanent Way Inspector = Present during trench excavation Telecom staff = Supervise laying and jointing of cables Agency carrying out cable work = Submit video recording of processes Skilled person = Conducts the jointing of PIJF cable</p> Signup and view all the answers

Match the cable sizes with their corresponding circuits for outdoor underground use:

<p>0.5 mm cond Dia twisted Pair = Subscriber's connection up to 5 kms 0.63 mm cond Dia twisted Pair = Subscriber's connections up to 10 km 0.5 mm Annealed Tinned Copper = Local subscriber's connection in a building 0.6 mm ATC = Trunk connections</p> Signup and view all the answers

Match the cable types with their specifications:

<p>50 pair, 0.63 mm cond.dia = Armoured polythene insulated polythene sheathed jelly filled Jelly filled armoured cables = Used for underground laying Trunk connections = 0.6 mm ATC Switch Board Subscriber's connections = 0.5 mm cond Dia twisted Pair</p> Signup and view all the answers

Match the cable testing steps with their purposes:

<p>Testing for insulation = Ensure no electrical faults Continuity of cores = Check proper connectivity Inspect bedding and armouring = Verify no damage during transit Inspecting the screen of the cable = Confirm signal integrity</p> Signup and view all the answers

Match the laying out cable process steps:

<p>Cable drums on cable-wheels = Facilitate easy transport of the cable Bring the drum to the trench = Prepare for laying the cable Draw the cable-wheels along the road = Guide the cable into the trench Labour party following the drum = Ensure careful placement of the cable</p> Signup and view all the answers

Match the cable weight to its corresponding type:

<p>0.5 mm cond Dia twisted Pair = 1.83 kg/km 0.63 mm cond Dia twisted Pair = 2.81 kg/km 0.5 mm Annealed Tinned Copper = 1.76 kg/km 0.6 mm ATC = 2.52 kg/km</p> Signup and view all the answers

Match the cable installation aspects with their relevance:

<p>Laying safely in trenches = Prevent cable damage Guiding cable from road = Ensure correct placement Testing before laying = Avoid future faults Using jelly filled cables underground = Prevent moisture ingress</p> Signup and view all the answers

Match the cable conductor sizes with their application:

<p>0.5 mm cond Dia twisted Pair = Short-distance subscriber connections 0.63 mm cond Dia twisted Pair = Longer-distance subscriber connections 0.5 mm ATC = Indoor local connections 0.6 mm ATC = Larger trunk connections</p> Signup and view all the answers

Match the term related to cables with its definition:

<p>Armoured cable = Provides protection against physical damage Jelly filled cable = Sealed to prevent moisture ingress Twisted Pair = Consists of pairs of wires twisted together Screened cable = Reduces electrical interference</p> Signup and view all the answers

Study Notes

Underground Copper Cable Systems

  • Railway departmental telecommunication lines are typically laid underground between railway offices, workshops, station yards, and trackside.
  • Spare capacity: When laying underground systems, consider potential future expansion, minimizing required modifications to existing circuits.
  • Cable types:
    • Quad Cable: 0.9 or 1.4 mm conductor diameter, used for control circuits and block interfaces. 1.4 mm cable is better for sections exceeding 12 kms.
    • Multi Pair Cable (PIJF): 10-200 pairs, 0.5 mm, 0.63 mm, or 0.9 mm conductors, used for exchange subscriber lines and branch cables.
    • Twisted Pair Switch Board Cable: 0.5 mm or 0.6 mm conductors, used for indoor distribution, MDF to exchange wiring.
    • RE Cable: (Paper & Polythene insulated copper quads) - phase out and replace with newer options.
  • Cable Sizes:
    • Outdoor: 0.5 mm & 0.63 mm subscriber connections
    • Indoor: 0.5 mm and 0.6 mm (Annealed Tinned Copper) for subscriber connections and trunk connections.
  • Exchange Cable Specification: Number of pairs, conductor diameter, insulation/sheath type (e.g., jelly-filled, armored, etc.)
  • Testing Before Laying:
    • Insulation and continuity testing of cores, armor, and screen.
    • Bedding, armor: inspect for damage.
  • Cable Laying:
    • Cable drums mounted on wheels, moved along the trench, with labor guiding and preventing damage.
    • If wheels are unavailable, drums mounted on an axle, labor carries the cable.
    • NEVER roll the drum off the road or drag the cable on the ground.
  • General Considerations:
    • Permanent Way Inspector required when excavating near tracks.
    • 'Quad' cables: diagonals form a circuit.
    • Reduce induction in telephone cables with lead/aluminum sheath and twisted pairs.
    • HDD (Horizontal Directional Drilling) is best for road/rail crossings in busy areas, using DWC pipes for protection.
    • Utilize existing concrete duct space for signaling cables for telecom cables (with precautions).
  • Cable Termination:
    • DP Box of approved type.
    • Direct termination.
  • PIJF Cable Jointing:
    • Done by trained personnel using RDSO specified jointing kits.
    • Supervised by telecom staff, with recording for quality assurance.
    • Thermo shrinkable material for armored PIJF cable with RDSO code of practice.
    • Different jointing kits for different cable sizes (e.g., TSF-1, TSF-2).
    • Quad cable joints: Underground or location box, painted black & yellow stripes, EC socket on location box.
    • Screen and armor of copper cables joined with suitable wires, grounded to ensure screening.

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Underground Copper Cable Systems PDF

Description

Explore the various types of underground copper cable systems used in railway telecommunication. This quiz covers cable types, sizes, and considerations for future expansions. Test your knowledge on Quad, Multi Pair, and Twisted Pair cables among others.

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